There are problems with tools like the Low Buck notcher - you've got to guess at how much material to remove for anything other than 90 degrees. Get it wrong and you have a bad fit. The hole saw versions have a limit on the sharpness of the angle. I got to borrow the use of a Mittler and was able to cut a 27 degree angle! The Mittler is high dollar and no way could I afford one just to build just one cage but it sure made life easy!